X9470 datasheet(9/25 Pages) XICOR

Part #	X9470

Description	RF Power Amplifier (PA) Bias Controller

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Manufacturer	XICOR [Xicor Inc.]

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REV 11.16 3/20/03

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Preliminary Information

X9470

Write Cycle Timing

Power Up Timing

Note:

Delays are measured from the time VCC is stable until the speciﬁed operation can be initiated. These parameters are not 100% tested.

Proper recall of stored wiper setting requires a VCC power-up ramp that is monotonic and with noise or glitches < 100mV. It is important

to correctly sequence voltages in an LDMOS ampliﬁer circuit. For the X9470 typical application, the VCC, then V+ pins should be pow-

ered before the VDD of the LDMOS to prevent LDMOS damage. Under no circumstances should the VDD be applied to the LDMOS

device before VCC and V+ are applied to the X9470.

DCP Default Power-up Tap Positions (shipped from factory)

Nonvolatile Write Cycle Timing

Note:

tWC is the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle. It is

the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used.

Symbol

Parameter

Min.

Max.

Unit

tr VCC

(10)

VCC Power-up rate

0.2

50

V/ms

VREF DCP

0

Bias Adjust DCP

0

Symbol

Parameter

Min.

Typ.(1)

Max.

Unit

tWC

(10)

Write Cycle Time

5

10

ms

SCL

SDA

tWC

8th Bit of Last Byte

ACK

Stop

Condition

Start

Condition

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